3 #include <sys/socket.h>
6 #include <sys/syscall.h>
8 #include <linux/rtnetlink.h>
9 #include <linux/sockios.h>
10 #include <linux/if_vlan.h>
11 #include <linux/if_bridge.h>
18 #include <netlink/msg.h>
19 #include <netlink/attr.h>
20 #include <netlink/socket.h>
21 #include <libubox/uloop.h>
28 struct uloop_fd uloop;
33 static int sock_ioctl = -1;
34 static struct nl_sock *sock_rtnl = NULL;
36 static int cb_rtnl_event(struct nl_msg *msg, void *arg);
39 handler_nl_event(struct uloop_fd *u, unsigned int events)
41 struct event_socket *ev = container_of(u, struct event_socket, uloop);
42 nl_recvmsgs(ev->sock, ev->cb);
45 static struct nl_sock *
46 create_socket(int protocol)
50 sock = nl_socket_alloc();
54 if (nl_connect(sock, protocol))
61 create_raw_event_socket(struct event_socket *ev, int protocol,
64 ev->sock = create_socket(protocol);
68 ev->uloop.fd = nl_socket_get_fd(ev->sock);
69 ev->uloop.cb = handler_nl_event;
70 uloop_fd_add(&ev->uloop, ULOOP_READ | ULOOP_EDGE_TRIGGER);
75 create_event_socket(struct event_socket *ev, int protocol,
76 int (*cb)(struct nl_msg *msg, void *arg))
78 // Prepare socket for link events
79 ev->cb = nl_cb_alloc(NL_CB_DEFAULT);
83 nl_cb_set(ev->cb, NL_CB_VALID, NL_CB_CUSTOM, cb, NULL);
85 return create_raw_event_socket(ev, protocol, handler_nl_event);
90 static struct event_socket rtnl_event;
92 sock_ioctl = socket(AF_LOCAL, SOCK_DGRAM, 0);
93 fcntl(sock_ioctl, F_SETFD, fcntl(sock_ioctl, F_GETFD) | FD_CLOEXEC);
95 // Prepare socket for routing / address control
96 sock_rtnl = create_socket(NETLINK_ROUTE);
100 if (!create_event_socket(&rtnl_event, NETLINK_ROUTE, cb_rtnl_event))
103 // Receive network link events form kernel
104 nl_socket_add_membership(rtnl_event.sock, RTNLGRP_LINK);
109 static void system_set_sysctl(const char *path, const char *val)
113 fd = open(path, O_WRONLY);
117 write(fd, val, strlen(val));
121 static void system_set_dev_sysctl(const char *path, const char *device, const char *val)
123 static char buf[256];
125 snprintf(buf, sizeof(buf), path, val);
126 system_set_sysctl(buf, val);
129 static void system_set_disable_ipv6(struct device *dev, const char *val)
131 system_set_dev_sysctl("/proc/sys/net/ipv6/conf/%s/disable_ipv6", dev->ifname, val);
134 // Evaluate netlink messages
135 static int cb_rtnl_event(struct nl_msg *msg, void *arg)
137 struct nlmsghdr *nh = nlmsg_hdr(msg);
138 struct ifinfomsg *ifi = NLMSG_DATA(nh);
139 struct nlattr *nla[__IFLA_MAX];
141 if (nh->nlmsg_type != RTM_DELLINK && nh->nlmsg_type != RTM_NEWLINK)
144 nlmsg_parse(nh, sizeof(*ifi), nla, __IFLA_MAX - 1, NULL);
145 if (!nla[IFLA_IFNAME])
148 struct device *dev = device_get(RTA_DATA(nla[IFLA_IFNAME]), false);
152 dev->ifindex = ifi->ifi_index;
153 device_set_present(dev, (nh->nlmsg_type == RTM_NEWLINK));
159 static int system_rtnl_call(struct nl_msg *msg)
161 int s = -(nl_send_auto_complete(sock_rtnl, msg)
162 || nl_wait_for_ack(sock_rtnl));
167 int system_bridge_delbr(struct device *bridge)
169 return ioctl(sock_ioctl, SIOCBRDELBR, bridge->ifname);
172 static int system_bridge_if(const char *bridge, struct device *dev, int cmd, void *data)
176 ifr.ifr_ifindex = dev->ifindex;
179 strncpy(ifr.ifr_name, bridge, sizeof(ifr.ifr_name));
180 return ioctl(sock_ioctl, cmd, &ifr);
183 int system_bridge_addif(struct device *bridge, struct device *dev)
185 system_set_disable_ipv6(dev, "1");
186 return system_bridge_if(bridge->ifname, dev, SIOCBRADDIF, NULL);
189 int system_bridge_delif(struct device *bridge, struct device *dev)
191 system_set_disable_ipv6(dev, "0");
192 return system_bridge_if(bridge->ifname, dev, SIOCBRDELIF, NULL);
195 static bool system_is_bridge(const char *name, char *buf, int buflen)
199 snprintf(buf, buflen, "/sys/devices/virtual/net/%s/bridge", name);
200 if (stat(buf, &st) < 0)
206 static char *system_get_bridge(const char *name, char *buf, int buflen)
212 snprintf(buf, buflen, "/sys/devices/virtual/net/*/brif/%s/bridge", name);
213 if (glob(buf, GLOB_NOSORT, NULL, &gl) < 0)
216 if (gl.gl_pathc == 0)
219 len = readlink(gl.gl_pathv[0], buf, buflen);
224 path = strrchr(buf, '/');
231 static int system_if_resolve(struct device *dev)
234 strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
235 if (!ioctl(sock_ioctl, SIOCGIFINDEX, &ifr))
236 return ifr.ifr_ifindex;
241 static int system_if_flags(const char *ifname, unsigned add, unsigned rem)
244 strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
245 ioctl(sock_ioctl, SIOCGIFFLAGS, &ifr);
246 ifr.ifr_flags |= add;
247 ifr.ifr_flags &= ~rem;
248 return ioctl(sock_ioctl, SIOCSIFFLAGS, &ifr);
260 static bool check_ifaddr(struct nlmsghdr *hdr, int ifindex)
262 struct ifaddrmsg *ifa = NLMSG_DATA(hdr);
264 return ifa->ifa_index == ifindex;
267 static bool check_route(struct nlmsghdr *hdr, int ifindex)
269 struct nlattr *tb[__RTA_MAX];
271 nlmsg_parse(hdr, sizeof(struct rtmsg), tb, __RTA_MAX - 1, NULL);
275 return *(int *)RTA_DATA(tb[RTA_OIF]) == ifindex;
278 static int cb_clear_event(struct nl_msg *msg, void *arg)
280 struct clear_data *clr = arg;
281 struct nlmsghdr *hdr = nlmsg_hdr(msg);
282 bool (*cb)(struct nlmsghdr *, int ifindex);
288 if (hdr->nlmsg_type != RTM_NEWADDR)
295 if (hdr->nlmsg_type != RTM_NEWROUTE)
304 if (!cb(hdr, clr->dev->ifindex))
307 D(SYSTEM, "Remove %s from device %s\n",
308 type == RTM_DELADDR ? "an address" : "a route",
310 memcpy(nlmsg_hdr(clr->msg), hdr, hdr->nlmsg_len);
311 hdr = nlmsg_hdr(clr->msg);
312 hdr->nlmsg_type = type;
313 hdr->nlmsg_flags = NLM_F_REQUEST;
315 if (!nl_send_auto_complete(sock_rtnl, clr->msg))
316 nl_wait_for_ack(sock_rtnl);
322 cb_finish_event(struct nl_msg *msg, void *arg)
330 error_handler(struct sockaddr_nl *nla, struct nlmsgerr *err, void *arg)
333 *pending = err->error;
338 system_if_clear_entries(struct device *dev, int type, int af)
340 struct clear_data clr;
341 struct nl_cb *cb = nl_cb_alloc(NL_CB_DEFAULT);
344 .rtm_flags = RTM_F_CLONED,
346 int flags = NLM_F_DUMP;
354 clr.size = sizeof(struct rtgenmsg);
357 clr.size = sizeof(struct rtmsg);
366 clr.msg = nlmsg_alloc_simple(type, flags);
370 nlmsg_append(clr.msg, &rtm, clr.size, 0);
371 nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, cb_clear_event, &clr);
372 nl_cb_set(cb, NL_CB_FINISH, NL_CB_CUSTOM, cb_finish_event, &pending);
373 nl_cb_err(cb, NL_CB_CUSTOM, error_handler, &pending);
375 nl_send_auto_complete(sock_rtnl, clr.msg);
377 nl_recvmsgs(sock_rtnl, cb);
385 * Clear bridge (membership) state and bring down device
387 void system_if_clear_state(struct device *dev)
389 static char buf[256];
395 dev->ifindex = system_if_resolve(dev);
399 system_if_flags(dev->ifname, 0, IFF_UP);
401 if (system_is_bridge(dev->ifname, buf, sizeof(buf))) {
402 D(SYSTEM, "Delete existing bridge named '%s'\n", dev->ifname);
403 system_bridge_delbr(dev);
407 bridge = system_get_bridge(dev->ifname, buf, sizeof(buf));
409 D(SYSTEM, "Remove device '%s' from bridge '%s'\n", dev->ifname, bridge);
410 system_bridge_if(bridge, dev, SIOCBRDELIF, NULL);
413 system_if_clear_entries(dev, RTM_GETROUTE, AF_INET);
414 system_if_clear_entries(dev, RTM_GETADDR, AF_INET);
415 system_if_clear_entries(dev, RTM_GETROUTE, AF_INET6);
416 system_if_clear_entries(dev, RTM_GETADDR, AF_INET6);
417 system_set_disable_ipv6(dev, "0");
420 static inline unsigned long
421 sec_to_jiffies(int val)
423 return (unsigned long) val * 100;
426 int system_bridge_addbr(struct device *bridge, struct bridge_config *cfg)
428 unsigned long args[4] = {};
430 if (ioctl(sock_ioctl, SIOCBRADDBR, bridge->ifname) < 0)
433 args[0] = BRCTL_SET_BRIDGE_STP_STATE;
434 args[1] = !!cfg->stp;
435 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
437 args[0] = BRCTL_SET_BRIDGE_FORWARD_DELAY;
438 args[1] = sec_to_jiffies(cfg->forward_delay);
439 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
441 system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/multicast_snooping",
442 bridge->ifname, cfg->igmp_snoop ? "1" : "0");
444 if (cfg->flags & BRIDGE_OPT_AGEING_TIME) {
445 args[0] = BRCTL_SET_AGEING_TIME;
446 args[1] = sec_to_jiffies(cfg->ageing_time);
447 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
450 if (cfg->flags & BRIDGE_OPT_HELLO_TIME) {
451 args[0] = BRCTL_SET_BRIDGE_HELLO_TIME;
452 args[1] = sec_to_jiffies(cfg->hello_time);
453 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
456 if (cfg->flags & BRIDGE_OPT_MAX_AGE) {
457 args[0] = BRCTL_SET_BRIDGE_MAX_AGE;
458 args[1] = sec_to_jiffies(cfg->max_age);
459 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
465 static int system_vlan(struct device *dev, int id)
467 struct vlan_ioctl_args ifr = {
468 .cmd = SET_VLAN_NAME_TYPE_CMD,
469 .u.name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD,
472 ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
475 ifr.cmd = DEL_VLAN_CMD;
478 ifr.cmd = ADD_VLAN_CMD;
481 strncpy(ifr.device1, dev->ifname, sizeof(ifr.device1));
482 return ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
485 int system_vlan_add(struct device *dev, int id)
487 return system_vlan(dev, id);
490 int system_vlan_del(struct device *dev)
492 return system_vlan(dev, -1);
496 system_if_apply_settings(struct device *dev)
500 memset(&ifr, 0, sizeof(ifr));
501 strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
502 if (dev->flags & DEV_OPT_MTU) {
503 ifr.ifr_mtu = dev->mtu;
504 ioctl(sock_ioctl, SIOCSIFMTU, &ifr);
506 if (dev->flags & DEV_OPT_TXQUEUELEN) {
507 ifr.ifr_qlen = dev->txqueuelen;
508 ioctl(sock_ioctl, SIOCSIFTXQLEN, &ifr);
510 if (dev->flags & DEV_OPT_MACADDR) {
511 memcpy(&ifr.ifr_hwaddr, dev->macaddr, sizeof(dev->macaddr));
512 ioctl(sock_ioctl, SIOCSIFHWADDR, &ifr);
515 dev->ifindex = system_if_resolve(dev);
518 int system_if_up(struct device *dev)
520 system_if_apply_settings(dev);
521 return system_if_flags(dev->ifname, IFF_UP, 0);
524 int system_if_down(struct device *dev)
526 return system_if_flags(dev->ifname, 0, IFF_UP);
529 int system_if_check(struct device *dev)
531 device_set_present(dev, (system_if_resolve(dev) >= 0));
535 int system_if_dump_stats(struct device *dev, struct blob_buf *b)
537 const char *const counters[] = {
538 "collisions", "rx_frame_errors", "tx_compressed",
539 "multicast", "rx_length_errors", "tx_dropped",
540 "rx_bytes", "rx_missed_errors", "tx_errors",
541 "rx_compressed", "rx_over_errors", "tx_fifo_errors",
542 "rx_crc_errors", "rx_packets", "tx_heartbeat_errors",
543 "rx_dropped", "tx_aborted_errors", "tx_packets",
544 "rx_errors", "tx_bytes", "tx_window_errors",
545 "rx_fifo_errors", "tx_carrier_errors",
551 snprintf(buf, sizeof(buf), "/sys/class/net/%s/statistics", dev->ifname);
552 stats_dir = open(buf, O_DIRECTORY);
556 for (i = 0; i < ARRAY_SIZE(counters); i++) {
557 fd = openat(stats_dir, counters[i], O_RDONLY);
562 len = read(fd, buf, sizeof(buf));
570 blobmsg_add_u32(b, counters[i], strtoul(buf, NULL, 0));
578 static int system_addr(struct device *dev, struct device_addr *addr, int cmd)
580 int alen = ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET4) ? 4 : 16;
581 struct ifaddrmsg ifa = {
582 .ifa_family = (alen == 4) ? AF_INET : AF_INET6,
583 .ifa_prefixlen = addr->mask,
584 .ifa_index = dev->ifindex,
594 ifa.ifa_index = dev->ifindex;
597 msg = nlmsg_alloc_simple(cmd, 0);
601 nlmsg_append(msg, &ifa, sizeof(ifa), 0);
602 nla_put(msg, IFA_LOCAL, alen, &addr->addr);
603 return system_rtnl_call(msg);
606 int system_add_address(struct device *dev, struct device_addr *addr)
608 return system_addr(dev, addr, RTM_NEWADDR);
611 int system_del_address(struct device *dev, struct device_addr *addr)
613 return system_addr(dev, addr, RTM_DELADDR);
616 static int system_rt(struct device *dev, struct device_route *route, int cmd)
618 int alen = ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET4) ? 4 : 16;
620 unsigned int flags = 0;
621 int ifindex = dev->ifindex;
624 have_gw = !!route->nexthop.in.s_addr;
626 have_gw = route->nexthop.in6.s6_addr32[0] ||
627 route->nexthop.in6.s6_addr32[1] ||
628 route->nexthop.in6.s6_addr32[2] ||
629 route->nexthop.in6.s6_addr32[3];
631 unsigned char scope = (cmd == RTM_DELROUTE) ? RT_SCOPE_NOWHERE :
632 (have_gw) ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK;
635 .rtm_family = (alen == 4) ? AF_INET : AF_INET6,
636 .rtm_dst_len = route->mask,
637 .rtm_table = RT_TABLE_MAIN,
638 .rtm_protocol = RTPROT_BOOT,
640 .rtm_type = (cmd == RTM_DELROUTE) ? 0: RTN_UNICAST,
644 if (cmd == RTM_NEWROUTE)
645 flags |= NLM_F_CREATE | NLM_F_REPLACE;
652 ifindex = dev->ifindex;
655 msg = nlmsg_alloc_simple(cmd, flags);
659 nlmsg_append(msg, &rtm, sizeof(rtm), 0);
662 nla_put(msg, RTA_DST, alen, &route->addr);
665 nla_put(msg, RTA_GATEWAY, alen, &route->nexthop);
667 if (route->flags & DEVADDR_DEVICE)
668 nla_put_u32(msg, RTA_OIF, ifindex);
670 return system_rtnl_call(msg);
673 int system_add_route(struct device *dev, struct device_route *route)
675 return system_rt(dev, route, RTM_NEWROUTE);
678 int system_del_route(struct device *dev, struct device_route *route)
680 return system_rt(dev, route, RTM_DELROUTE);
683 int system_flush_routes(void)
685 const char *names[] = {
686 "/proc/sys/net/ipv4/route/flush",
687 "/proc/sys/net/ipv6/route/flush"
691 for (i = 0; i < ARRAY_SIZE(names); i++) {
692 fd = open(names[i], O_WRONLY);
702 time_t system_get_rtime(void)
707 if (syscall(__NR_clock_gettime, CLOCK_MONOTONIC, &ts) == 0)
710 if (gettimeofday(&tv, NULL) == 0)